package com.wzy.netty.core.websocket;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

/**
 * 描述
 * 创建人    Wzy
 * 创建时间: 2020-05-22  14:02
 */
public class MyServer {
    public static void main(String[] args) {
        NioEventLoopGroup boosGroup = new NioEventLoopGroup();
        NioEventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(boosGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            //基于http协议,使用http的编码解码器
                            pipeline.addLast(new HttpServerCodec());
                            //是以块的方式写,添加chunkedWritehandler
                            pipeline.addLast(new ChunkedWriteHandler());
                            /*
                             * http 数据在传输过程中是分段的,httpObjectAggregater,就是可以将多个段聚合
                             * 这就是为什么当浏览器发送大量数据是就会发出多次http请求的原因
                             */
                            pipeline.addLast(new HttpObjectAggregator(8192));
                            /**
                             * 1.对应的websocket ,他的数据是以 帧(frame)的形式传播
                             * 2.可以看到webSocketFrame 下面六个子类
                             * 3.浏览器请求时 ws://localhost:7000/hello 表示请求的uri
                             * 4.WebSocketServerProtocolHandler 核心功能是将http协议升级为ws协议,
                             * 保持长连接
                             * 5.通过一个状态码来转换的 101
                             */
                            pipeline.addLast(new WebSocketServerProtocolHandler("/hello"));

                            //自定义的handler,处理业务逻辑
                            pipeline.addLast(new MyTextWebSocketFrameHandler());
                        }
                    });
            ChannelFuture channelFuture = serverBootstrap.bind(7999).sync();
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            boosGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}
